# Gem e2, 2 seater 2002 E825 Lithium Upgrade(tighter fit) **URL:** \ **Category:** GEM Forum\ **Created:** [February 10, 2017, 7:15pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042 "2017-02-10T19:15:48Z")\ **Posts on this page:** 20\ **Page:** 8
**Author:** ![Todd](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/todd/32/1061_2.png) [@Todd](https://community.electricforum.com/u/Todd)\ **Post date:** [April 8, 2017, 10:02pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/144 "2017-04-08T22:02:21Z")
![](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/f/f45a17d98132cd082b0957061d2626a765138fb1.jpg) 4.7k resistance, right? ---
**Author:** ![nakedwaterskier](https://avatars.discourse-cdn.com/v4/letter/n/258eb7/32.png) [@nakedwaterskier](https://community.electricforum.com/u/nakedwaterskier)\ **Post date:** [April 8, 2017, 10:32pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/145 "2017-04-08T22:32:05Z")
what wattage on that 4.7k resistor? ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [April 8, 2017, 10:35pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/146 "2017-04-08T22:35:12Z")
Connection test for Troy. ![](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/b/b85b5d7bcf41729e56d3d8441aa9817184497c9b.JPG) ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [April 8, 2017, 10:38pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/147 "2017-04-08T22:38:26Z")
> [@nakedwaterskier](#): > > what wattage on that 4.7k resistor? 1/4w is fine. 1/2 won’t hurt. Value not important. Anything close. Measure voltage at input of ssr to see if it’s within range. Not ove 32 volts. SSR not needed with DQ charger. I supply an interface to charger white wire. ---
**Author:** ![nakedwaterskier](https://avatars.discourse-cdn.com/v4/letter/n/258eb7/32.png) [@nakedwaterskier](https://community.electricforum.com/u/nakedwaterskier)\ **Post date:** [April 8, 2017, 10:40pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/148 "2017-04-08T22:40:37Z")
1/4 or 14 watt? nevermind [http://www.ebay.com/itm/1-2W-1-2-WATT-Carbon-Film-Resistors-10PC-You-Chose-Resistance-USA-FAST-SHIPPING-/172565887233?var=&hash=item282dba7901:m:mNYBNXfn1QOP6Wh3htfmDbA](http://www.ebay.com/itm/1-2W-1-2-WATT-Carbon-Film-Resistors-10PC-You-Chose-Resistance-USA-FAST-SHIPPING-/172565887233?var=&hash=item282dba7901:m:mNYBNXfn1QOP6Wh3htfmDbA) ---
**Author:** ![Todd](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/todd/32/1061_2.png) [@Todd](https://community.electricforum.com/u/Todd)\ **Post date:** [April 8, 2017, 11:26pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/149 "2017-04-08T23:26:05Z")
> [@nakedwaterskier](#): > > 1/4 or 14 watt? 14W would be way big, huge! ---
**Author:** ![nakedwaterskier](https://avatars.discourse-cdn.com/v4/letter/n/258eb7/32.png) [@nakedwaterskier](https://community.electricforum.com/u/nakedwaterskier)\ **Post date:** [April 8, 2017, 11:52pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/150 "2017-04-08T23:52:42Z")
I would like to thank everyone. It is like pulling teeth getting info from manufacturers! ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [April 8, 2017, 11:59pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/151 "2017-04-08T23:59:41Z")
Too fast for me, I edited in like 30 seconds. 🙂 ---
**Author:** ![nakedwaterskier](https://avatars.discourse-cdn.com/v4/letter/n/258eb7/32.png) [@nakedwaterskier](https://community.electricforum.com/u/nakedwaterskier)\ **Post date:** [April 21, 2017, 2:22am UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/152 "2017-04-21T02:22:10Z")
FINALLY! HOORAY! Hi Jeffery, Yes, you are correct, I should explain how to connect the BMS to charger in manual, please check the updated manual, The relay has a coil to control the relay open or close, OPEN means charge cut off, and close charge continue. BMS drive the coil with Vin on BMS controller port. If BMS powered by external power supply, the Vin is external power supply output voltage, if BMS powered by battery pack from 8S to 24S, the Vin is battery voltage, take a 16S LiPO battery sample, the Vin is 48V(3V_16) to 67.2V(4.2_16), for 17S to 24S battery, the Vin is 16S battery voltage, so the relay coil voltage must be accordance with Vin, and the coil current should be less than 1A. if charge relay and discharge relay connected to BMS24, the total coil current must be less than 1A. The current shunt, relay and blue case don’t be in contact with any metal. Thanks. Best Regards, Jason Wang ---
**Author:** ![nakedwaterskier](https://avatars.discourse-cdn.com/v4/letter/n/258eb7/32.png) [@nakedwaterskier](https://community.electricforum.com/u/nakedwaterskier)\ **Post date:** [April 21, 2017, 2:28am UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/153 "2017-04-21T02:28:37Z")
Warning Before connect the relay to charge or discharge controller, please confirm the coil of relay voltage. the BMS controller will output Vin to power the coil, if the BMS24 will be powered by external power supply, Vin is external power supply output voltage, if powered by battery pack, Vin will be battery pack voltage. If the Vin is not correct on driving coil, please use voltage regulator to power coil. ---
**Author:** ![nakedwaterskier](https://avatars.discourse-cdn.com/v4/letter/n/258eb7/32.png) [@nakedwaterskier](https://community.electricforum.com/u/nakedwaterskier)\ **Post date:** [April 21, 2017, 3:16pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/154 "2017-04-21T15:16:57Z")
![](https://canada1.discourse-cdn.com/flex030/uploads/electricforum/original/2X/8/8b7bb1c1f02f333dac37c5d3e5360aabcafc4c60.png) ---
**Author:** ![Jeffrey\_Gillette](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/jeffrey_gillette/32/791_2.png) [@Jeffrey\_Gillette](https://community.electricforum.com/u/Jeffrey_Gillette)\ **Post date:** [April 29, 2017, 3:12pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/155 "2017-04-29T15:12:00Z")
[http://www.eco-aesc-lb.com/en/product/liion\_ev/](http://www.eco-aesc-lb.com/en/product/liion_ev/) They bridge the centers also ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [April 29, 2017, 5:08pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/156 "2017-04-29T17:08:23Z")
Sold the last of my big LTO batteries this morning. Like to have a Leaf pack if you get a lead on one. Chevy Volts are common, Leafs not so much. Would really like to find a 2017 if I could, but 2014-16 is OK. ---
**Author:** ![Jeffrey\_Gillette](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/jeffrey_gillette/32/791_2.png) [@Jeffrey\_Gillette](https://community.electricforum.com/u/Jeffrey_Gillette)\ **Post date:** [April 29, 2017, 5:46pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/157 "2017-04-29T17:46:48Z")
Troy and i used a reliable junkyard…LDQ or something like that. Ask Troy. Not best customer service but their parts r as described. They often get hybrid and electric packs from totalled cars. ---
**Author:** ![Todd](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/todd/32/1061_2.png) [@Todd](https://community.electricforum.com/u/Todd)\ **Post date:** [April 29, 2017, 9:40pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/158 "2017-04-29T21:40:56Z")
I’ve been getting mine from eBay. I look for $100 w/shipping. If you find more than you need I’m interested in doubling the pack that I’m running now. ---
**Author:** ![nakedwaterskier](https://avatars.discourse-cdn.com/v4/letter/n/258eb7/32.png) [@nakedwaterskier](https://community.electricforum.com/u/nakedwaterskier)\ **Post date:** [May 18, 2017, 8:09pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/159 "2017-05-18T20:09:48Z")
Not bothering to hook up the Overcharge and Undercharge wires from the BMS24 after all that. My GEM OEM alarm/warning goes off when I get low. My reprogrammed Zivan cuts the current way back at around 78 or 79 volts and cuts off at 81 volts. Plus I Dash Mounted my BMS24 so I can see what is going on live if I want to. So, I figure why hassle with BMS24 Over and Under wires. However, even with dash mounting the BMS24, the display isn’t very bright ESP. IN SUNLIGHT. ---
**Author:** ![Nrapp33](https://avatars.discourse-cdn.com/v4/letter/n/eb8c5e/32.png) [@Nrapp33](https://community.electricforum.com/u/Nrapp33)\ **Post date:** [May 29, 2017, 4:25pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/160 "2017-05-29T16:25:49Z")
[https://www.ebay.com/itm/182596073282](https://www.ebay.com/itm/182596073282) I’m not the most literate on battery technology. What are people’s thoughts on this? ---
**Author:** ![Inwo](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/inwo/32/1067_2.png) [@Inwo](https://community.electricforum.com/u/Inwo)\ **Post date:** [May 29, 2017, 7:23pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/161 "2017-05-29T19:23:20Z")
They will work. I got a set and sent them back. Not up to specs and sold at new price. 20s is pretty close to a drop in conversion though. If you buy from that seller, get insurance. He puts them in an undersized flat rate box with no packing. They will be pretty beat up when you get them. $300 per KHW is more than I will spend. A 16kwh salvage Volt battery is about $1600 I just got one on Ebay for $1200 delivered. 25% price of the Bosch Enough to do 2 or 3 Gems. ---
**Author:** ![Jeffrey\_Gillette](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/jeffrey_gillette/32/791_2.png) [@Jeffrey\_Gillette](https://community.electricforum.com/u/Jeffrey_Gillette)\ **Post date:** [May 29, 2017, 8:06pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/162 "2017-05-29T20:06:49Z")
Local reputable junkyard is best bet. ---
**Author:** ![Todd](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.electricforum.com/todd/32/1061_2.png) [@Todd](https://community.electricforum.com/u/Todd)\ **Post date:** [June 11, 2017, 6:04pm UTC](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042/163 "2017-06-11T18:04:09Z")
I found the limit on my 22 cell battery bank, when it gets to 70V I better charge it. It charges to 89.6V and will run several days (3 or 4 miles a day) before it drops to 83V. After 83V I notice it started dropping a little quicker, and at 76V I have to use the spoof by-pass for the main contractor to pick up. Now that I know my limits I won’t need to find another tow home. [Previous page](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042.md?page=7) [Next page](https://community.electricforum.com/t/gem-e2-2-seater-2002-e825-lithium-upgrade-tighter-fit/12042.md?page=9)